Ann. Limnol. - Int. J. Lim.
Volume 55, 2019
|Number of page(s)||6|
|Published online||11 October 2019|
Movement patterns of juvenile and adult noble crayfish (Astacus astacus) in a small stream, determined by radiotelemetry
T.G. Masaryk Water Research Institute, p.r.i.; Podbabská 2582/30, 160 00 Prague, Czech Republic
2 Norwegian Institute of Nature Research; Fakkelgården, 2624 Lillehammer, Norway
* Corresponding author: firstname.lastname@example.org
Accepted: 9 September 2019
This article reports on the results of the first radiotelemetric field study comparing the movement patterns of juvenile and adult noble crayfish (Astacus astacus) over the 24-h cycle. During our study (in summer, outside the reproduction period), juveniles moved over significantly longer distances than adults; upstream movements prevailed in both groups. The longest distance covered by an individual crayfish during a three-hour interval was 110 m (in the upstream direction). Adults moved most frequently at dusk and least frequently during daytime. Among juveniles, the likelihood of movement did not significantly differ between the times of day; however, distances covered by juveniles were the longest at night and significantly shorter during daytime and at dusk. Juveniles and adults exhibited very similar local activity (motion within a single place) with high values at night and low values during daytime.
Key words: ranging behaviour / diurnal cycle / activity / dispersal / conservation
© T. Daněk et al., published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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